K's place is a pretty good option if you want to stay in Silom. The apartment is indeed very central but very quiet as it is in the small side street. It's great that you have a daily cleaning, fresh towels and bottles of water. You have both complete privacy/comfort of staying in an apartment but convenience of staying in a hotel. One thing I had to notice immediately after coming into the flat was it's smell of mould. The fan in the bathroom didn't work and the room was kept without ventilation, so it smelled. The smell goes away as you turn on AC and it should be fine as long as ventilate the air regularly. I'd definitely consider K's apartment again when I visit Bangkok.